以纳米CaCO3浆料和丁苯胶乳（SBR）为原料，将两者直接混合制得了纳米CaCO3填充型粉末橡胶复合粒子。研究表明，当粉末化体系中纳米CaCO3和SBR的重量比≥1时，纳米CaCO3兼具隔离剂和凝聚剂的作用。复合粒子的粒径随着纳米CaCO3填充量的增加而减小，所制得的复合粒子的颗粒尺寸均小于200tLm，纳米CaCO3以50nm原始粒径均匀分散在复合粒子中；其成粉机理为纳米CaCO3表面的钙离子和胶乳粒子表面的负离子发生键合作用，破乳而形成粉末橡胶复合粒子。%Powdered rubber composite particle with nano-calcium carbonate filled was prpeared by simply blending nano-CaCOa slurry and styrene-butadiene latex. It was demonstrated that nano-CaCO3 could served as both separant and coagulant in the powdering system when the weight ratio of nano-CaCO3 to SBR was greater than 1. The size of the composite particle decreased with increasing nano-CaCOa loading and was always smaller than 200htm, the nano-CaCO3 dispersed uniformly with the original size of 50nm in the composite particle matrix. The powdering mechanism could be described as the demulsification due to the attractive interaction of dissolved positive ion and the anion originating from the surface of CaCOa and latex respectively.
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